O SlideShare utiliza cookies para otimizar a funcionalidade e o desempenho do site, assim como para apresentar publicidade mais relevante aos nossos usuários. Se você continuar a navegar o site, você aceita o uso de cookies. Leia nosso Contrato do Usuário e nossa Política de Privacidade.
O SlideShare utiliza cookies para otimizar a funcionalidade e o desempenho do site, assim como para apresentar publicidade mais relevante aos nossos usuários. Se você continuar a utilizar o site, você aceita o uso de cookies. Leia nossa Política de Privacidade e nosso Contrato do Usuário para obter mais detalhes.
Historical Origins of the Model
Lewin’s Field Theory (1935)
Introduced the concept of barriers to and
facilitators of behavior change
U.S. Public Health Service (1950’s)
Group of social psychologists trying to explain
why people did not participate in prevention and
Two major influences from learning theory:
Stimulus Response Theory
Stimulus Response Theory
Learning results from events which reduce
the psychological drives that cause behavior
In other words, we learn to enact new
behaviors, change existing behaviors, and
reduce or eliminate behaviors because of the
consequences of our actions.
Reinforcers, punishments, rewards
Emphasize the role of subjective hypotheses
and expectations held by the individual.
Beliefs, attitudes, desires, expectations, etc.
Influencing beliefs and expectations about
the situation can drive behavior
change, rather than trying to influence the
Expectancy: person believes that increased
effort leads to improved performance
Instrumentality: person believes that
improved performance leads to a certain
outcome or reward
Outcomes: person values that reward or
HBM is a value-expectancy theory
Based on these assumptions:
People desire to avoid illness or get well
People believe that a specific health action that is
available to him or her will prevent illness
Initial development based on probability-
based studies of 1200 adults
People who believed they were susceptible AND
believed in the benefits of early detection were
much more likely to be screened for TB.
Components of HBM
Perceived Susceptibility: how likely do you think
you are to have this health issue?
Perceived Severity: how serious a problem do you
believe this health issue is?
Perceived Benefits: how well does the
recommended behavior reduce the risk(s)
associated with this health issue?
Perceived Barriers: what are the potential negative
aspects of doing this recommended behavior?
Additional Components of
Cues to Action: factors which cause you to
change, or want to change. (not systematically
Self-Efficacy: one’s “conviction that one can
successfully execute the behavior required to
produce the outcomes” (Bandura, 1977).
As the health concerns of the nation have shifted to
lifestyle-related conditions, self-efficacy has taken on
greater importance, both as an independent construct, and
as a component of HBM
Individual Perceptions Modifying Factors Likelihood of Action
Cues to Action